WO2020084929A1 - Dispositif de codage ou de décodage vidéo, procédé de codage ou de décodage vidéo, programme, et support d'enregistrement - Google Patents

Dispositif de codage ou de décodage vidéo, procédé de codage ou de décodage vidéo, programme, et support d'enregistrement Download PDF

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WO2020084929A1
WO2020084929A1 PCT/JP2019/035171 JP2019035171W WO2020084929A1 WO 2020084929 A1 WO2020084929 A1 WO 2020084929A1 JP 2019035171 W JP2019035171 W JP 2019035171W WO 2020084929 A1 WO2020084929 A1 WO 2020084929A1
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value
parameter
deblocking
candidate
quantization parameter
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PCT/JP2019/035171
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Japanese (ja)
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慶一 蝶野
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日本電気株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/117—Filters, e.g. for pre-processing or post-processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/154—Measured or subjectively estimated visual quality after decoding, e.g. measurement of distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards

Definitions

  • the present invention relates to a video encoding or decoding device, a video encoding or decoding method, a program, and a recording medium.
  • Deblocking filters that reduce block noise caused by quantization noise are used, for example, in video encoding devices and video decoding devices (see, for example, Patent Document 1).
  • An object of the present invention is to provide a video encoding or decoding device, a video encoding or decoding method, a program, and a recording medium that can appropriately reduce block noise.
  • a video encoding or decoding apparatus uses a lookup table indicating a correspondence relationship between a candidate value related to a quantization parameter and a candidate value of a deblocking parameter, to quantize a block boundary in an image.
  • the lookup table includes a determination unit that determines a deblocking parameter corresponding to a value related to the conversion parameter, and a processing unit that performs a filtering process related to the block boundary using the deblocking parameter, and the lookup table is defined by a predetermined candidate value. Also includes a candidate range for the quantization parameter including a large candidate value and a candidate range for the deblocking parameter corresponding to the candidate range for the quantization parameter.
  • a video encoding or decoding method uses a lookup table indicating a correspondence relationship between a candidate value for a quantization parameter and a candidate value for a deblocking parameter to quantize a block boundary in an image. Determining a deblocking parameter corresponding to a value related to the conversion parameter, and performing a filtering process related to the block boundary using the deblocking parameter, wherein the lookup table is larger than a predetermined candidate value. It includes a candidate range for the quantization parameter including the candidate value and a candidate range for the deblocking parameter corresponding to the candidate range for the quantization parameter.
  • a program uses a lookup table indicating a correspondence relationship between a candidate value for a quantization parameter and a candidate value for a deblocking parameter to determine a value for a quantization parameter at a block boundary in an image. Determining a corresponding deblocking parameter and performing a filtering process on the block boundary using the deblocking parameter, wherein the look-up table includes a quantum including a candidate value larger than a predetermined candidate value.
  • a computer is caused to execute a video encoding or decoding process including a candidate value range for the quantization parameter and a candidate value range for the deblocking parameter corresponding to the candidate value range for the quantization parameter.
  • a recording medium uses a lookup table indicating a correspondence relationship between a candidate value for a quantization parameter and a candidate value for a deblocking parameter to determine a value for a quantization parameter at a block boundary in an image. Determining a deblocking parameter corresponding to, and performing a filtering process on the block boundary using the deblocking parameter, the lookup table including a candidate value larger than a predetermined candidate value. It is readable by a computer that records a program for causing a computer to perform a video encoding or decoding process, including a candidate range of quantization parameters and a candidate range of deblocking parameters corresponding to the candidate range of quantization parameters. It is a non-transitory recording medium
  • a video encoding or decoding apparatus uses a lookup table indicating a correspondence relationship between a candidate value related to a quantization parameter and a candidate value of a deblocking parameter, to quantize a block boundary in an image.
  • Determination unit that determines a deblocking parameter corresponding to a value related to the quantization parameter, an acquisition unit that acquires an offset value of the value related to the quantization parameter of the block boundary, and the quantum of the block boundary based on the offset value.
  • a correction unit that corrects the deblocking parameter corresponding to a value related to the conversion parameter, and a filter processing unit that performs a filter process related to the block boundary using the corrected deblocking parameter, and is based on the offset value. Correction width of the deblocking parameter , Which is the de-blocking parameter value corresponding to the fluctuation by the quantization parameter corresponding to each element in the scaling list applied to the block boundary.
  • a video encoding or decoding method uses a lookup table indicating a correspondence relationship between a candidate value for a quantization parameter and a candidate value for a deblocking parameter to quantize a block boundary in an image. Determining a deblocking parameter corresponding to a value related to the quantization parameter, obtaining an offset value of the value related to the quantization parameter at the block boundary, and based on the offset value, the quantization parameter at the block boundary. Compensating the deblocking parameter corresponding to the value of the deblocking parameter, and performing a filtering process on the block boundary using the compensated deblocking parameter, the deblocking parameter of the deblocking parameter based on the offset value.
  • the correction width is the above block It is a value wherein according to the deblocking parameters that vary by the quantization parameter corresponding to each element in the scaling list applied to the field.
  • a program uses a lookup table indicating a correspondence relationship between a candidate value for a quantization parameter and a candidate value for a deblocking parameter to determine a value for a quantization parameter at a block boundary in an image. Determining a corresponding deblocking parameter, obtaining an offset value of a value for the quantization parameter of the block boundary, and corresponding to a value for the quantization parameter of the block boundary based on the offset value.
  • a recording medium uses a lookup table indicating a correspondence relationship between a candidate value for a quantization parameter and a candidate value for a deblocking parameter to determine a value for a quantization parameter at a block boundary in an image. Determining a deblocking parameter corresponding to the block boundary, obtaining an offset value of a value related to the quantization parameter of the block boundary, and corresponding to a value related to the quantization parameter of the block boundary based on the offset value. Correcting the deblocking parameter to Performing a filtering process on the block boundary using the corrected deblocking parameter, wherein a correction width of the deblocking parameter based on the offset value is set in each scaling list applied to the block boundary.
  • FIG. 1 is an explanatory diagram showing an example of a schematic configuration of a filter device 100 according to the first embodiment.
  • FIG. 2 is a diagram showing a specific example of the scaling list.
  • FIG. 3A is a diagram showing a specific example of the first lookup table according to the comparative example.
  • FIG. 3B is a diagram showing a specific example of the first lookup table according to the first embodiment.
  • FIG. 4 is a diagram showing an example of specific numerical values of the first lookup table according to the comparative example and the first embodiment.
  • FIG. 5A is a diagram showing a specific example of the second lookup table according to the comparative example.
  • FIG. 5B is a diagram showing a specific example of the second lookup table according to the first embodiment.
  • FIG. 6 is a diagram showing an example of specific numerical values of the second lookup table according to the comparative example and the first embodiment.
  • FIG. 7 is a flowchart for explaining an example of the flow of processing performed by the filter device 100.
  • FIG. 8 is a block diagram showing a schematic configuration of the video encoding device 800.
  • FIG. 9 is a block diagram showing a schematic configuration of the video decoding device 900.
  • FIG. 10 is a block diagram showing a schematic configuration of an information processing system 1000 to which the filter device 100 is applied.
  • FIG. 11 is a block diagram showing an example of a schematic configuration of a video encoding device 1100 according to the second embodiment.
  • FIG. 12 is a block diagram showing an example of a schematic configuration of a video decoding device 1200 according to the second embodiment.
  • the purpose of this embodiment is to enable appropriate reduction of block noise.
  • quantization of block boundaries in an image is performed using a look-up table indicating a correspondence relationship between candidate values related to quantization parameters and candidate values for deblocking parameters.
  • the deblocking parameter corresponding to the value related to the parameter is determined, and the block boundary filtering process is performed using the deblocking parameter.
  • the lookup table includes a candidate range of the quantization parameter including a candidate value larger than a predetermined candidate value, and a deblocking parameter candidate range corresponding to the candidate range of the quantization parameter.
  • FIG. 1 is an explanatory diagram showing an example of a schematic configuration of a filter device 100 according to the first embodiment.
  • the filter device 100 includes a deblocking parameter processing unit 110 and a filter processing unit 120.
  • the deblocking parameter processing unit 110 also includes a determination unit 111, an acquisition unit 113, and a correction unit 115.
  • the filter device 100 having the above-described configuration performs filter processing on a block boundary in a dequantized reconstructed image performed in video encoding or decoding processing, and outputs the image subjected to the filter processing. Output as an image.
  • the filter device 100 uses a lookup table indicating the correspondence between the candidate values for the quantization parameter and the candidate values for the deblocking parameter to determine the value for the quantization parameter at the block boundary in the reconstructed image. Determine the corresponding deblocking parameters. Then, the filter device (filter processing unit 120) performs the filter processing on the block boundary using the deblocking parameter.
  • the lookup table includes a candidate range for a quantization parameter that includes a candidate value larger than a predetermined candidate value and a candidate range for a deblocking parameter that corresponds to the candidate range for the quantization parameter.
  • the lookup table includes the candidate range of the deblocking parameter corresponding to the candidate value larger than the predetermined candidate value (for example, the predetermined upper limit candidate value), It becomes possible to adjust the deblocking parameter appropriately. More specifically, for example, the following advantages over the case of expanding the deblocking parameter candidate range so as to correspond to both the lower limit value side of the quantization parameter and the predetermined upper limit candidate value side are provided. is there. That is, it is possible to appropriately perform the filter processing while suppressing an increase in the data capacity of the lookup table.
  • Quantization parameter is a parameter for expressing the size of the quantization step which shows the divisor at the time of quantization.
  • the quantization process for obtaining the quantization coefficient qij of the orthogonal transform coefficient cij corresponding to the frequency component (i, j) is calculated according to the following Expressions 1 to 3.
  • qij Int [cij / Qstep] (Equation 1)
  • Qstep (m ij ⁇ 2 qbit ) / (Qscale (qP% 6))
  • Int [] is a function that converts an input into an integer value.
  • Qscale is a quantization step coefficient.
  • m ij is a quantization weighting coefficient.
  • qP% 6 is a remainder obtained by dividing qP by 6.
  • log 2 N is the base 2 logarithm of N.
  • BitDepth is the pixel bit precision of the signal to be processed. N indicates the size of orthogonal transform.
  • the quantization process is performed so that the quantization step is doubled every time the quantization parameter is increased by 6.
  • quantization weighting for each frequency component may be used.
  • FIG. 2 is a diagram showing a specific example of the scaling list. As shown in FIG. 2, the candidate range of the quantization weighting coefficient corresponding to each element in the scaling list applied to the block boundary is 1 to 255.
  • the relationship between the quantization parameter Qp and the quantization step size Qstep (i, j, Qp) can be simplified and expressed as follows.
  • the quantization step size corresponding to the quantization parameter may change from 1/16 times to 16 times according to the weighting coefficient of each element in the scaling list.
  • the average value of the quantization parameters of the target region eg, the adjacent block of the above-mentioned block boundary
  • the lookup table indicates a correspondence relationship between the candidate value of the average value of the quantization parameter of the target area and the candidate value of the deblocking parameter.
  • the filter device 100 determines the average value of the quantization parameter of the target area, and refers to the lookup table to determine the deblocking parameter corresponding to the average value of the quantization parameter. To do.
  • the value related to the quantization parameter will be described below on the assumption that it corresponds to the average value of the quantization parameter of the target region, but the present invention is not limited to this assumption.
  • the value regarding the quantization parameter for example, an intermediate value, a minimum value, or a maximum value of the quantization parameter of the target region may be used.
  • the filtering process on the block boundary is performed on the prediction image at the block boundary based on the analysis results such as the prediction mode, the motion vector, the presence / absence of the transform coefficient, and the pixel variation amount. This is a process for alleviating a block-like distortion caused by the shift and the quantization (quantization noise) of the transform coefficient.
  • the filtering process on the block boundary is performed by, for example, HEVC (High-Efficiency Video Coding) / H. This corresponds to the deblocking filter process defined by H.265, but is not limited to this.
  • the quantization noise is determined by the quantization step
  • the characteristics of the filter processing (ease, strength, etc.) are adjusted in proportion to the quantization step.
  • the deblocking parameter is specifically a parameter for adjusting the characteristics of the filter processing regarding the block boundary. Further, as described below, the deblocking parameter includes the following two types of parameters, for example.
  • the deblocking parameter includes a first parameter ⁇ for adjusting how easily the filtering process is performed on the block boundary.
  • the first parameter ⁇ is HEVC (High-Efficiency Video Coding) / H. It may correspond to the deblocking parameter ⁇ defined in H.265, but is not limited to this.
  • the lookup table stores a correspondence relationship between the candidate value of the average value Q AVE of the quantization parameters of the target region and the candidate value of the first parameter ⁇ .
  • a first look-up table indicating
  • FIG. 3A is a diagram showing a specific example of the first lookup table according to the comparative example.
  • FIG. 3B is a diagram showing a specific example of the first lookup table according to the first embodiment.
  • FIG. 4 is a diagram showing an example of specific numerical values of the first lookup table according to the comparative example and the first embodiment.
  • the candidate value of the average value Q AVE of the quantization parameter is 0 to 51, and the first parameter The candidate value of ⁇ monotonically increases according to the candidate value of the average value Q AVE .
  • the first lookup table according to the first embodiment includes the candidate value of the average value Q AVE of the quantization parameters that can be taken by the first lookup table according to the comparative example and the first parameter ⁇ .
  • the candidate value as shown in FIGS. 3B and 4, the following candidate value range is further included.
  • the first look-up table according to the first embodiment has a candidate range of the average value Q AVE of the quantization parameter that includes a candidate value larger than 51 (the predetermined candidate value) and a larger value range than 51. And a candidate value range of the first parameter ⁇ corresponding to the candidate value range of the average value Q AVE of the quantization parameter including the candidate value.
  • the candidate range of the average value Q AVE of the quantization parameter including the candidate value larger than 51 includes the candidate value 1 to 12 larger than 51 (52 ⁇ Q AVE ⁇ 63).
  • the upper limit of the ease with which the deblocking filter is applied is increased.
  • the value is four times higher than that of the first lookup table according to the comparative example.
  • the deblocking parameter candidate range is set so as to correspond to both the lower limit value side of the quantization parameter and the predetermined upper limit candidate value side.
  • the deblocking parameter includes a second parameter tc for adjusting the strength of the filtering process on the block boundary.
  • the second parameter tc is HEVC (High-Efficiency Video Coding) / H. It may correspond to the deblocking parameter tc defined in H.265, but is not limited to this.
  • the lookup table stores the candidate value of the average value Q AVE of the quantization parameters of the target area and the candidate value of the second parameter tc. It includes a second look-up table showing the correspondence.
  • FIG. 5A is a diagram showing a specific example of the second lookup table according to the comparative example.
  • FIG. 5B is a diagram showing a specific example of the second lookup table according to the first embodiment.
  • FIG. 6 is a diagram showing an example of specific numerical values of the second lookup table according to the comparative example and the first embodiment.
  • the candidate value of the average value Q AVE of the quantization parameter is 0 to 53, and the second parameter The candidate value of tc monotonically increases according to the candidate value of the average value Q AVE .
  • the following candidate value range is further included as shown in FIGS.
  • the second look-up table has a candidate value range of the average value Q AVE of the quantization parameter that includes a candidate value larger than 53 (the predetermined candidate value) and a larger value range than 53. And a candidate range of the second parameter ⁇ corresponding to the candidate range of the average value Q AVE of the quantization parameters including candidate values.
  • the candidate range of the average value Q AVE of the quantization parameter including the candidate value larger than 53 includes the candidate value 1 to 12 larger than 53 (54 ⁇ Q AVE ⁇ 65).
  • the second lookup table according to the first embodiment by expanding the candidate value of the average value Q AVE of the quantization parameter to 65, the upper limit value of the strength of the deblocking filter is increased. , 4 times higher than the second lookup table according to the comparative example.
  • the deblocking parameter candidate range is set so as to correspond to both the lower limit value side of the quantization parameter and the predetermined upper limit candidate value side.
  • the filter device 100 may correct the deblocking parameter determined by the determining unit 111 based on the offset value as described below.
  • the filter device 100 acquires the offset value of the average value of the quantization parameter at the block boundary.
  • the filter device 100 corrects the deblocking parameter corresponding to the average value of the quantization parameter at the block boundary based on the offset value. Specifically, the filter device 100 (correction unit 115) adds the offset value to the average value of the quantization parameter at the block boundary, and uses the lookup table to deblock the parameter corresponding to the added value. Is determined as the corrected deblocking parameter. In this way, the offset value can be grasped as a value for correcting the deblocking parameter, that is, an offset value of the deblocking parameter.
  • the offset value is an offset value used to correct the first parameter ⁇ (hereinafter also referred to as a first offset value) and an offset value used to correct the second parameter tc (hereinafter , Also referred to as a second offset value).
  • the correction width of the deblocking parameter based on the offset value depends on the quantization parameter corresponding to each element in the scaling list applied to the block boundary, as described later. A value according to the varying deblocking parameter is used.
  • the quantization step may change from 1/16 times to 16 times as described above. Therefore, the value corresponding to the deblocking parameter also varies from 1/16 to 16 times depending on the quantization parameter corresponding to each element in the scaling list applied to the block boundary.
  • the range in which the offset value can be taken is ⁇ 24 to 24. preferable.
  • the correction range of the deblocking parameter becomes 1/16 times to 16 times.
  • the range of the value corresponding to the offset value is -12 to 12.
  • the correction range of the deblocking parameter is limited to 1/4 to 4 times.
  • the candidate range in the lookup table is expanded, and the range that the offset value can take is doubled as compared with the comparative example. It becomes possible to perform the deblocking filter processing more appropriately in consideration of possible values of the quantization parameter corresponding to each element in.
  • the filter device 100 may acquire the offset value by decoding the syntax element included in the bitstream.
  • the filter device 100 acquisition unit 113 doubles the syntax element decoded from the syntax element.
  • the value can be acquired as the offset value.
  • the syntax element beta_offset_div2 corresponding to the first offset value and the syntax element tc_offset_div2 corresponding to the second offset value are, for example, Is defined as beta_offset_div2 and tc_offset_div2 specify the default deblocking parameter offsets for ⁇ and tC (divided by 2) that are applied for pictures referring to the picture parameter set unless the default deblocking parameter offsets are overridden by the deblocking parameter offsets present in the slice header for pictures referring to the picture parameter set.
  • the values of beta_offset_div2 and tc_offset_div2 shall both be in the range of -12 to 12, inclusive.
  • the filter device 100 may acquire the offset value by determining the offset value according to the quantization parameter corresponding to each element in the scaling list.
  • the filter device 100 may acquire the offset value by determining the offset value according to the average value of the quantization parameter corresponding to each element in the scaling list.
  • each of the first offset value and the second offset value is a syntax element obtained by decoding a bitstream and an average value of quantization parameters corresponding to each element in the scaling list. And may be acquired based on both.
  • the first offset value beta_offset and the second offset value tc_offset are calculated according to the following equations 6 to 8.
  • beta_offset ((scalingListDataPresent)? tmp: 0) + (beta_offset_div2 ⁇ 1)
  • tc_offset ((scalingListDataPresent)? tmp: 0) + (tc_offset_div2 ⁇ 1)
  • tmp log2 (ave (ScliningListtData) / 16) / 6 (Equation 8)
  • scalingListDataPresent is a value indicating whether or not the data of the scaling list is present, and is “1” when the data of the scaling list is present, and is “0” otherwise.
  • scalingListDataPresent may be a value decoded from the syntax element of the sequence parameter or picture parameter included in the bitstream. ((ScalingListDataPresent)? Tmp: 0) indicates that when scalingListDataPresent is 1, it has a value of tmp, and when scalingListDataPresent is 0, it has a value of "0”.
  • “Beta_offset_div2” is a syntax element corresponding to a part of the first offset value, and can take a value of ⁇ 6 to 6, for example.
  • tc_offset_div2 is a syntax element corresponding to a part of the second offset value, and can take a value of ⁇ 6 to 6, for example.
  • ⁇ is a left shift operator, which means to shift the value expressed in binary number to the left, and to double the value in decimal number expression.
  • ave (ScryingListtData) is a function that outputs the average value of the quantization parameter corresponding to each element in the scaling list.
  • a part of the offset value is explicitly acquired according to the syntax element, and the remaining part of the offset value is a quantization parameter corresponding to each element in the scaling list. It is possible to obtain implicitly according to the average value of. Further, according to Expressions 6 to 8 described above, unlike the specific example 1, the range of the syntax elements beta_offset_div2 and tc_offset_div2 is not expanded from ⁇ 6 to 6 to ⁇ 12 to 12, so the compression efficiency of the bitstream is reduced. There is an advantage that the decrease of
  • the first offset value and the second offset value are not limited to the average value of the quantization parameter corresponding to each element in the scaling list, and, for example, the quantization parameter corresponding to each element in the scaling list. May be obtained according to the median value of, or the average of the maximum value and the minimum value, or the like.
  • FIG. 7 is a flowchart for explaining an example of a process flow performed by the filter device 100.
  • step S701 the determination unit 111 determines the deblocking parameter corresponding to the average value of the quantization parameter at the block boundary using the lookup table. Then, it progresses to step S703.
  • step S703 the acquisition unit 113 acquires the offset value of the average value of the quantization parameter. Then, it progresses to step S705.
  • step S705 the correction unit 115 uses the lookup table to determine the deblocking parameter corresponding to the value obtained by adding the offset value to the average value of the quantization parameter as the corrected deblocking. Then, it progresses to step S707.
  • step S707 the filter processing unit 120 uses the corrected deblocking parameter to perform the filtering process on the block boundary, and ends the process illustrated in FIG. 7.
  • Video encoding device 800 The filter device 100 described above can be applied to, for example, a video encoding device 800 as shown in FIG.
  • FIG. 8 is a block diagram showing a schematic configuration of the video encoding device 800.
  • the video encoding device 800 includes a block division unit 801, a conversion / quantization unit 802, a variable length coding unit 803, an inverse quantization / inverse conversion unit 804, a deblocking filter 805, and a pixel application offset.
  • a unit 806, a buffer 807, an intra-screen prediction unit 808, and a motion compensation prediction unit 809 are provided.
  • the block division unit 801 divides the input image signal into blocks.
  • the conversion / quantization unit 802 frequency-converts the prediction error image obtained by subtracting the prediction image signal output from the intra-picture prediction unit 808 or the motion compensation prediction unit 809 from the input image signal, and the frequency-converted prediction error image (conversion Coefficient) is quantized.
  • the variable-length encoding unit 803 entropy-encodes the quantized transform quantized value and difference information of the block based on, for example, CABAC (Context-based Adaptive Binary Arithmetic Coding), and outputs it as a bitstream.
  • CABAC Context-based Adaptive Binary Arithmetic Coding
  • the inverse quantization / inverse transform unit 804 inversely quantizes the quantized block, and inverse frequency transforms the inversely quantized frequency transform coefficient.
  • the reconstructed image signal obtained by adding the predicted image signal to the prediction error image signal subjected to the inverse frequency conversion is supplied to the deblocking filter 805 and the intra-frame prediction unit 808.
  • the intra-screen prediction unit 808 performs intra-screen prediction processing on the reconstructed image signal and outputs it as the above-mentioned predicted image signal.
  • the deblocking filter 805 incorporates the filter device 100 described above and applies deblocking filter processing to the reconstructed image signal.
  • the pixel application offset unit 806 performs pixel application offset processing on the reconstructed image signal to which the deblocking filter processing has been applied, and supplies the processed reconstructed image signal to the buffer 807.
  • the motion compensation prediction unit 809 performs motion compensation prediction processing on the input image using the reconstructed image signal stored in the buffer 807, and outputs it as the above-described predicted image signal.
  • the video encoding device 800 that generates a bitstream by the above-described operation can appropriately perform the filter processing regarding the block boundary by the filter device 100 incorporated in the deblocking filter 805.
  • Video decoding device 900 The filter device 100 described above can be applied to, for example, a video decoding device 900 as shown in FIG.
  • FIG. 9 is a block diagram showing a schematic configuration of the video decoding device 900.
  • the video decoding device 900 includes a variable length decoding unit 901, an inverse quantization / inverse conversion unit 902, a deblocking filter 903, a pixel application offset unit 904, a buffer 905, an intra-screen prediction unit 906, and a motion.
  • the compensation prediction unit 907 is provided.
  • variable length decoding unit 901 entropy-decodes the codeword extracted from the bitstream based on, for example, CABAC.
  • the transform quantization value entropy-decoded by the variable length decoding unit 901 is supplied to the dequantization / inverse transformation unit 902. Further, the difference information and the like are supplied to the intra-screen prediction unit 906 and the motion compensation prediction unit 907.
  • the inverse quantization / inverse transformation unit 902 inversely quantizes the transformed quantized value in the quantization step. Further, the inverse quantization / inverse transform unit 902 inverse frequency transforms the dequantized frequency transform coefficient.
  • the reconstructed image signal in which the prediction image signal is added to the prediction error signal subjected to the inverse frequency conversion is supplied to the deblocking filter 903 and the intra-screen prediction unit 906.
  • the deblocking filter 903 incorporates the filter device 100 described above and applies deblocking filter processing to the reconstructed image signal.
  • the pixel application offset unit 904 performs pixel application offset processing on the reconstructed image signal to which the deblocking filter processing has been applied, and outputs the processed reconstructed image signal to the outside and supplies it to the buffer 905.
  • the in-screen prediction unit 906 performs in-screen prediction processing on the reconstructed image signal and outputs it as a predicted image signal. Further, the motion compensation prediction unit 907 uses the reconstructed image signal stored in the buffer 905 to perform motion compensation prediction processing on the input image, and outputs it as the above-described predicted image signal.
  • the video decoding device 900 that decodes a bitstream by the above-described operation can appropriately perform the filter processing regarding the block boundary by the filter device 100 incorporated in the deblocking filter 903.
  • Information processing system 1000 The filter device 100 described above may be realized by an information processing system 1000 as shown in FIG. 10, for example.
  • FIG. 10 is a block diagram showing a schematic configuration of an information processing system 1000 to which the filter device 100 is applied.
  • the information processing system 1000 includes a processor 1001, a program memory 1002, a storage medium 1003 for storing video data, and a storage medium 1004 for storing a bitstream.
  • the storage medium 1003 and the storage medium 1004 may be separate storage media or may be storage areas formed of the same storage medium.
  • a magnetic storage medium such as a hard disk can be used as the storage medium.
  • the information processing system 1000 can appropriately perform the filter processing on the block boundary by installing a computer program that realizes the function of the filter device 100 in the program memory 1002.
  • the lookup table includes a candidate range for a quantization parameter that includes a candidate value larger than a predetermined candidate value and a deblocking parameter candidate range that corresponds to the candidate range for the quantization parameter.
  • a deblocking parameter candidate range that corresponds to the candidate range for the quantization parameter.
  • the range that the offset value can take may be expanded. That is, the correction width of the deblocking parameter based on the offset value varies depending on the possible value of the quantization parameter corresponding to each element in the scaling list applied to the block boundary. May be enlarged so that
  • FIG. 11 is a block diagram showing an example of a schematic configuration of a video encoding device 1100 according to the second embodiment.
  • the video encoding device 1100 includes a determination unit 1110 and a filter processing unit 1120.
  • FIG. 12 is a block diagram showing an example of a schematic configuration of a video decoding device 1200 according to the second embodiment.
  • the video decoding device 1200 includes a determination unit 1210 and a filter processing unit 1220.
  • the video encoding device 1100 uses a look-up table showing a correspondence relationship between the candidate value related to the quantization parameter and the candidate value of the deblocking parameter to determine the block boundary of the image. Determine a deblocking parameter that corresponds to a value for the quantization parameter. Then, the video encoding device 1100 (filter processing unit 1120) uses the deblocking parameter to perform the filtering process on the block boundary.
  • the lookup table includes a candidate range for a quantization parameter that includes a candidate value larger than a predetermined candidate value and a candidate range for a deblocking parameter that corresponds to the candidate range for the quantization parameter.
  • the video encoding device 1100 may operate the filter device 100 according to the first embodiment.
  • the video decoding device 1200 uses a lookup table showing the correspondence between the candidate values for the quantization parameter and the candidate values for the deblocking parameter to determine the value for the quantization parameter at the block boundary in the image. Determine the corresponding deblocking parameters. Then, the video decoding device 1200 (filter processing unit 1220) performs the filtering process on the block boundary using the deblocking parameter.
  • the lookup table includes a candidate range for a quantization parameter that includes a candidate value larger than a predetermined candidate value and a candidate range for a deblocking parameter that corresponds to the candidate range for the quantization parameter.
  • the video decoding device 1200 may perform the operation of the filter device 100 according to the first embodiment.
  • the second embodiment has been described. According to the second embodiment, for example, it becomes possible to appropriately perform the filtering process on the block boundary.
  • the steps in the processing described in this specification do not necessarily have to be executed in time series in the order described in the sequence diagram.
  • the steps in the processing may be executed in an order different from the order described as the sequence diagram or may be executed in parallel.
  • some of the steps in the process may be deleted and additional steps may be added to the process.
  • a method may also be provided that includes processing of the components of the apparatus described herein (e.g., the determining unit, the obtaining unit, the correcting unit, and / or the filtering unit), and the processing of the above components may be performed by a processor.
  • a program may be provided for execution by the.
  • a non-transitory computer readable medium in which the program is recorded and which can be read by a computer may be provided.
  • such devices, modules, methods, programs, and computer-readable non-transitory recording media are also included in the present invention.
  • the lookup table includes a candidate range for a quantization parameter that includes a candidate value larger than a predetermined candidate value, and a candidate range for a deblocking parameter that corresponds to the candidate range for the quantization parameter.
  • the deblocking parameter includes a first parameter for adjusting how easily the filtering process is performed on the block boundary
  • the lookup table includes a candidate range for a quantization parameter that includes a candidate value larger than 51, and a candidate range for the first parameter that corresponds to the candidate range for the quantization parameter that includes a candidate value larger than 51.
  • the deblocking parameters include a second parameter for adjusting the strength of the filtering on the block boundaries
  • the lookup table includes a candidate range for a quantization parameter that includes a candidate value greater than 53, and a candidate range for the second parameter that corresponds to the candidate range for the quantization parameter greater than 53.
  • (Appendix 4) The video encoding or decoding device according to any one of appendices 1 to 3, wherein the candidate value range regarding the quantization parameter includes a candidate value that is 1 to 12 larger than the predetermined candidate value.
  • An acquisition unit that acquires an offset value of a value related to the quantization parameter at the block boundary, A correction unit that corrects the deblocking parameter corresponding to the value related to the quantization parameter of the block boundary based on the offset value,
  • the correction width of the deblocking parameter based on the offset value is a value according to the deblocking parameter that varies depending on the quantization parameter corresponding to each element in the scaling list applied to the block boundary, Appendix 1 to 5.
  • Appendix 7 The video encoding or decoding apparatus according to appendix 6, wherein the acquisition unit acquires the offset value by decoding a syntax element included in a bitstream.
  • Appendix 8 The video encoding or decoding device according to appendix 6, wherein the acquisition unit acquires the offset value by determining the offset value according to a quantization parameter corresponding to each element in the scaling list.
  • (Appendix 11) Determining the deblocking parameter corresponding to the value related to the quantization parameter of the block boundary in the image using a lookup table showing the correspondence between the candidate value related to the quantization parameter and the candidate value of the deblocking parameter, Filtering with respect to the block boundary using the deblocking parameter,
  • the lookup table includes a candidate range for a quantization parameter that includes a candidate value larger than a predetermined candidate value, and a candidate range for a deblocking parameter that corresponds to the candidate range for the quantization parameter.
  • (Appendix 12) Determining the deblocking parameter corresponding to the value related to the quantization parameter of the block boundary in the image using a lookup table showing the correspondence between the candidate value related to the quantization parameter and the candidate value of the deblocking parameter, Filtering with respect to the block boundary using the deblocking parameter,
  • the lookup table includes a candidate range for a quantization parameter that includes a candidate value larger than a predetermined candidate value, and a candidate range for a deblocking parameter that corresponds to the candidate range for the quantization parameter.
  • a computer-readable non-transitory recording medium recording a program for causing a computer to execute a process.
  • the determination unit that determines the deblocking parameter corresponding to the value of the quantization parameter of the block boundary in the image,
  • An acquisition unit that acquires an offset value of a value related to the quantization parameter at the block boundary,
  • a correction unit that corrects the deblocking parameter corresponding to the value related to the quantization parameter at the block boundary based on the offset value;
  • a filter processing unit that performs a filter process on the block boundary using the corrected deblocking parameter,
  • the correction width of the deblocking parameter based on the offset value is a value according to the deblocking parameter that varies depending on the quantization parameter corresponding to each element in the scaling list applied to the block boundary, video encoding Or a decoding device.
  • (Appendix 14) Determining the deblocking parameter corresponding to the value related to the quantization parameter of the block boundary in the image using a lookup table showing the correspondence between the candidate value related to the quantization parameter and the candidate value of the deblocking parameter, Obtaining an offset value of a value for the quantization parameter at the block boundary, Correcting the deblocking parameter corresponding to a value for the quantization parameter at the block boundary based on the offset value; Performing filtering on the block boundaries using the corrected deblocking parameters, The correction width of the deblocking parameter based on the offset value is a value according to the deblocking parameter that varies depending on the quantization parameter corresponding to each element in the scaling list applied to the block boundary, video encoding Or a decryption method.
  • Filter Device 110 Deblocking Parameter Processing Unit 111, 1110, 1210 Determination Unit 113 Acquisition Unit 115 Correction Unit 120, 1120, 1220 Filter Processing Unit 800, 1100 Video Encoding Device 900, 1200 Video Decoding Device

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Abstract

[Problème] Permettre une réduction correcte du bruit de bloc. À cet effet, l'invention concerne un dispositif de filtrage 100 qui comprend : une unité de détermination 111 pour déterminer, à l'aide d'une table de consultation, un paramètre de déblocage correspondant à une valeur concernant un paramètre de quantification d'une limite de bloc dans une image ; et une unité de traitement de filtrage 120 pour effectuer un traitement de filtrage concernant la limite de bloc à l'aide du paramètre de déblocage. La table de consultation comprend : une plage de valeurs candidates concernant des paramètres de quantification, comprenant des valeurs candidates supérieures à une valeur candidate prédéterminée ; et une plage de valeurs candidates de paramètre de déblocage correspondant à la plage de valeurs candidates concernant les paramètres de quantification.
PCT/JP2019/035171 2018-10-23 2019-09-06 Dispositif de codage ou de décodage vidéo, procédé de codage ou de décodage vidéo, programme, et support d'enregistrement WO2020084929A1 (fr)

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WO2009050897A1 (fr) * 2007-10-19 2009-04-23 Panasonic Corporation Dispositif de conversion de débit de codage, procédé de conversion de débit de codage, et circuit intégré
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JP2018026837A (ja) * 2012-04-06 2018-02-15 ソニー株式会社 画像処理装置および方法、プログラム、並びに記録媒体

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WO2009050897A1 (fr) * 2007-10-19 2009-04-23 Panasonic Corporation Dispositif de conversion de débit de codage, procédé de conversion de débit de codage, et circuit intégré
JP2018026837A (ja) * 2012-04-06 2018-02-15 ソニー株式会社 画像処理装置および方法、プログラム、並びに記録媒体
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